os/mm/mmplugins/cameraplugins/source/mmcameraclientplugin/mmcameraclientsession/src/mmcameraclientinterface.cpp
1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/os/mm/mmplugins/cameraplugins/source/mmcameraclientplugin/mmcameraclientsession/src/mmcameraclientinterface.cpp Fri Jun 15 03:10:57 2012 +0200
1.3 @@ -0,0 +1,178 @@
1.4 +// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
1.5 +// All rights reserved.
1.6 +// This component and the accompanying materials are made available
1.7 +// under the terms of "Eclipse Public License v1.0"
1.8 +// which accompanies this distribution, and is available
1.9 +// at the URL "http://www.eclipse.org/legal/epl-v10.html".
1.10 +//
1.11 +// Initial Contributors:
1.12 +// Nokia Corporation - initial contribution.
1.13 +//
1.14 +// Contributors:
1.15 +//
1.16 +// Description:
1.17 +//
1.18 +
1.19 +/**
1.20 + @file
1.21 + @internalComponent
1.22 +*/
1.23 +
1.24 +#include "mmcameraclientinterface.h"
1.25 +#include <e32uid.h>
1.26 +
1.27 +
1.28 +/**
1.29 + * Starts the server process.
1.30 + *
1.31 + * Simultaneous launching of two such processes should be detected when the second
1.32 + * one attempts to create the server object, failing with KErrAlreadyExists.
1.33 + */
1.34 +static TInt StartServer()
1.35 + {
1.36 + const TUidType serverUid(KNullUid, KExecutableImageUid, KECamServerUid3);
1.37 + RProcess server;
1.38 + TInt err = server.Create(KMMCameraServerExe, KNullDesC, serverUid);
1.39 + if (err != KErrNone)
1.40 + {
1.41 + return err;
1.42 + }
1.43 + TRequestStatus stat;
1.44 + server.Rendezvous(stat);
1.45 + if (stat != KRequestPending)
1.46 + {
1.47 + server.Kill(0); // abort startup
1.48 + }
1.49 + else
1.50 + {
1.51 + server.Resume(); // logon OK - start the server
1.52 + }
1.53 +
1.54 + User::WaitForRequest(stat); // wait for start or death
1.55 + // we can't use the 'exit reason' if the server panicked as this
1.56 + // is the panic 'reason' and may be '0' which cannot be distinguished
1.57 + // from KErrNone
1.58 + err = (server.ExitType() == EExitPanic) ? KErrGeneral : stat.Int();
1.59 + server.Close();
1.60 +
1.61 + return err;
1.62 + }
1.63 +
1.64 +
1.65 +/**
1.66 + * Connect to the server.
1.67 + *
1.68 + * Will attempt to start the server if it has not yet been started or has been shut down.
1.69 + */
1.70 +TInt RMMCameraSession::Connect()
1.71 + {
1.72 + TInt serverStartRetries = 2;
1.73 + for (;;)
1.74 + {
1.75 + // Attempt to create a session to the server
1.76 + TInt err = CreateSession(KMMCameraServerName, TVersion(0, 0, 0), KECamNumAsynchMsg);
1.77 + if (err != KErrNotFound && err != KErrServerTerminated)
1.78 + {
1.79 + return err;
1.80 + }
1.81 +
1.82 + if (--serverStartRetries == 0)
1.83 + {
1.84 + return err;
1.85 + }
1.86 +
1.87 + // Server not found or shut down so (re)start the server
1.88 + err = StartServer();
1.89 + if (err != KErrNone && err != KErrAlreadyExists)
1.90 + {
1.91 + return err;
1.92 + }
1.93 + }
1.94 + }
1.95 +
1.96 +
1.97 +//
1.98 +// Synchronous interface APIs
1.99 +//
1.100 +
1.101 +TInt RMMCameraSession::SendMessage(TECamMsgId aMsgId, TCameraParameterId aParameterId, TDes8& aMessage)
1.102 + {
1.103 + if (aMessage.Length() > KECamMaxMessage)
1.104 + {
1.105 + return KErrArgument;
1.106 + }
1.107 +
1.108 + return SendReceive(aMsgId, TIpcArgs(aParameterId, &aMessage));
1.109 + }
1.110 +
1.111 +TInt RMMCameraSession::SendMessage(TECamMsgId aMsgId, TCameraParameterId aParameterId, TInt aMessage)
1.112 + {
1.113 + return SendReceive(aMsgId, TIpcArgs(aParameterId, aMessage));
1.114 + }
1.115 +
1.116 +TInt RMMCameraSession::SendMessage(TECamMsgId aMsgId, TDes8& aMessage)
1.117 + {
1.118 + if (aMessage.Length() > KECamMaxMessage)
1.119 + {
1.120 + return KErrArgument;
1.121 + }
1.122 +
1.123 + return SendReceive(aMsgId, TIpcArgs(&aMessage));
1.124 + }
1.125 +
1.126 +TInt RMMCameraSession::SendMessage(TECamMsgId aMsgId, TInt aMessage)
1.127 + {
1.128 + return SendReceive(aMsgId, TIpcArgs(aMessage));
1.129 + }
1.130 +
1.131 +TInt RMMCameraSession::SendMessage(TECamMsgId aMsgId)
1.132 + {
1.133 + return SendReceive(aMsgId);
1.134 + }
1.135 +
1.136 +TInt RMMCameraSession::SendRxMessage(TECamMsgId aMsgId, TCameraParameterId aParameterId, TDes8& aMessage) const
1.137 + {
1.138 + if (aMessage.Length() > KECamMaxMessage)
1.139 + {
1.140 + return KErrArgument;
1.141 + }
1.142 +
1.143 + return SendReceive(aMsgId, TIpcArgs(aParameterId, &aMessage));
1.144 + }
1.145 +
1.146 +TInt RMMCameraSession::SendRxMessage(TECamMsgId aMsgId, TCameraParameterId aParameterId, TInt aMessage) const
1.147 + {
1.148 + return SendReceive(aMsgId, TIpcArgs(aParameterId, aMessage));
1.149 + }
1.150 +
1.151 +TInt RMMCameraSession::SendRxMessage(TECamMsgId aMsgId, TDes8& aMessage) const
1.152 + {
1.153 + if (aMessage.Length() > KECamMaxMessage)
1.154 + {
1.155 + return KErrArgument;
1.156 + }
1.157 +
1.158 + return SendReceive(aMsgId, TIpcArgs(&aMessage));
1.159 + }
1.160 +
1.161 +
1.162 +//
1.163 +// Asynchronous interface APIs
1.164 +//
1.165 +
1.166 +TInt RMMCameraSession::ReceiveMessage(TECamMsgId aMsgId, TDes8& aMessage, TRequestStatus& aStatus)
1.167 + {
1.168 + if (aMessage.Length() > KECamMaxMessage)
1.169 + {
1.170 + return KErrArgument;
1.171 + }
1.172 +
1.173 + SendReceive(aMsgId, TIpcArgs(&aMessage), aStatus);
1.174 +
1.175 + return KErrNone;
1.176 + }
1.177 +
1.178 +void RMMCameraSession::ReceiveMessage(TECamMsgId aMsgId, TInt aMessage, TRequestStatus& aStatus)
1.179 + {
1.180 + SendReceive(aMsgId, TIpcArgs(aMessage), aStatus);
1.181 + }